<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
   
   datalist <input  list="a1" >
   <datalist id="a1">
        <option value="taiyuan">太原市</option>
        <option value="datong">大同市</option>
        <option value="shenyang">沈阳市</option>
        <option >辽阳市</option>
        <option >大连市</option>
    </datalist>

</body>
</html>